Quote Originally Posted by MacMillan of Rathdown
As the clan system applies to the kilt, the custom has evolved whereby a gentleman only wears the tartan associated with his surname as this is an outward manifestation of the intangible bond of loyalty that exists between a clansman and his chief. Now, if you have no ties to another clan, then custom would dictate that you formally become a member of your wife's clan, and then wear that clan tartan as your own, handing it down to your children as your family's "clan tartan".
If a man formally becomes a member of his wife's clan, does he take the clan name? Or keep his own?

And what about the children? If they wear their mother's clan tartan, do they also take that surname? Otherwise, they'd be wearing a tartan that's not associated with their surname (i.e. the clan-less surname of their father).